Earth of mass 6×10^24 kg is in motion around the sun with a linear velocity of magnitude 30 km/s.

a) Determine the magnitude of the linear momentum of the center of mass of Earth.
b) Is this linear momentum conseved?

1 answer

Linear momentum: mv (change km to m)

Yes, it is conserved, as the sun is also rotating around the center of gravity of E-Sun system. The direction of the Sun's momentum at any point is equal and opposite to that of Earth.